Spring-scale



(No Model.)

J. S. GEORGE.

SPRING SCALE.

Patented Mar. 13,1883.

Photolhhograpbcr. Wnhlngtcn. n. c.

UNITED STATES PATENT OFFICE.

JOHN S. GEORGE, OF BRIDGEPORT, CONNECTICUT.

SPRING-SCALE.

SPECIFICATION forming part of Letters Patent No. 273,720, dated. March 13, 1883.

Application filed April 19, 1882. (No model.)

To all whom it may concern Be it known that I, JOHN S. GEORGE, a citizen of the United States, residing at Bridgeport, in the county of Fairfield and State of Connecticut, have invented a new and useful Improvement in Spring-Scales; and I hereby declare that the following is a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it belongs to make and use the same.

My invention relates to a spring-scale, and has for its object a ready means of adjustment to compensate wear and strain of spring, and having a pointer or indicator so constructed in relation to the graduations on the scale that smaller fractions of a pound may be indicated without increasing thenumberof graduations.

To more clearly understand my invention, reference is had to the drawings accompanying this specification.

Figure 1 is a view of the scale complete. Fig. 2 is a sectional view.

A is the shell; B, the spring; C, the adjusting-screw; D, the lock-nut; E, threaded not attached to shell A; F, thumb-ring; G, weight-support, having threaded stud H; I, the indicator-ring; J, rod connecting indicator-ring I with weight-support G.

Its construction and operation are as Follows: The shell A is constructed of tubing, and having at its upper end (see Fig. 2) the stationary threaded nut E. In place of this nut, the shell Acan be headed sufficiently thick to provide a thread strong enough tosupport the weight required. The adjusting-screw C is screwed into the nut Eand held in any position required by the jam-nut D. The coils of the spring B engage with the threads of the screw C, and it hangs pendent therefrom. The interior of the shell A is snfliciently large in diameter to insure a free movement of the spring without friction. The lower end of the spring B is attached to the stud H of the weight-support G in the same manner as at its upper end, as described. The indicator I is a narrow ring encircling the shell A, and sufficiently large to move freely up and down the same without friction, and is secured to the weight-support G by the rod J, thereby securing a simultaneous movement of the indicator and weightsupport. The indicator-ring I (see Fig. 1) is made wider than the pound-graduations on the shell A. The upper edge, a, of the ring, as represented, stands at zero, and the lower edge, I), is situated half-way between the poundmark 1 and the quarter-pound mark 0. A downward movement of the ring I until the lower edge, I), coincides with the mark 0 will indicate two ounces. The top edge, a, of the indicator ring will indicate pounds, haltpounds, and quarters. The lower edge, I), will, when coinciding with any mark on the scale, indicate two ounces, which must be added to the weight indicated by the upper edge, a, after it has passed bythc firstquarter-mark immediately below zero. To compensate for the stretch of the spring which will occur from long use, the spring B is attached, as represented, (see F1g. 2.) to the adjusting-screw C, said screw passing through the threaded nut E, said not being held stationary in the shell A. To adjust the scale, the nut D isloosened and the weight-support turned to the right or left, as required. The spring B, engaging firmly with the screw U and stud H, enables the screw C to be forced up or down, as may be required, in the nut E, until the indicator is set properly with thezero-mark on the scale. The nut D is then screwed firmly down.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-- t; In a spring-scale, the combination of the shell A, indicator-ring I, arranged to indicate even weights on its upper edge, a, and fractions of the sameonits lower edge, b, with the rod J, weight-support G, spring B, adjustingscrew C, and nuts D and E, substantially as described, and for the purpose set forth.

JOHN S. GEORGE.

Witnesses HERMAN Gauss, RUDOLPH KosT. 

